Cordless window curtain

ABSTRACT

A cordless window curtain has a window curtain rod, a curtain body, lateral rails, a locating rope assembly and an elastic tension component. The reducing guide slots are set at one side of the lateral rails facing the curtain body and connected with the hollow slot. The width of the reducing guide slot must be smaller than that of the lateral rail and the width of the reducing guide slot is preferably between 2 mm and 5.9 mm. Two flanged guide shafts are protruded from both ends of the hollow bottom rod of the curtain body. These two flanged guide shafts are provided with a through-hole for threading of two lower locating sections of the locating rope assembly. The outer end of two flanged guide shafts is inserted into the reducing guide slot, such that the flanged guide shaft can slide vertically along the path of the reducing guide slot.

CROSS-REFERENCE TO RELATED U.S. APPLICATIONS

Not applicable.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

NAMES OF PARTIES TO A JOINT RESEARCH AGREEMENT

Not applicable.

REFERENCE TO AN APPENDIX SUBMITTED ON COMPACT DISC

Not applicable.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a window curtain, and more particularly to an innovative one which allows the cordless window curtain to be set on lateral rails.

2. Description of Related Art

Including Information Disclosed Under 37 CFR 1.97 and 37 CFR 1.98.

The difference between the cordless window curtain of the present invention and common rope-pulling window curtain lies in that the curtain body is elevated manually by the force applied by the user. The curtain body is stopped once the force applied by the user is released. Such a cordless window curtain is designed in such a manner that the pull rope for pulling and controlling the curtain body is concealed to prevent any safety hazard against kids arising from accidental entanglement during play.

Moreover, according to the design of the driving mechanism for the curtain body of said cordless window curtain, the rope-pulling device cannot be fully eliminated, and a rail is generally arranged to provide a holding space for the pull rope exposed at both sides of the curtain body. Yet, the following shortcomings still remain with respect to said cordless window curtain with lateral rails:

The cross section of the lateral rail of the conventional cordless window curtain is designed into a

-shaped pattern, such that an opening is set at one side facing the curtain body. This opening is almost as wide as the lateral rail, generally from 2.5 cm to 3.5 cm. However, small fingers of kids could extend easily into the lateral rail from the opening, and are then hooked by the pull rope exposed at both sides of the curtain body, leading to possible safety hazards.

On the other hand, owing to a bigger opening set on the lateral rail, the curtain body of the conventional cordless window curtain could not be stably limited or driven, resulting in unstable shift and bigger noise of the curtain body.

Thus, to overcome the aforementioned problems of the prior art, it would be an advancement if the art to provide an improved structure that can significantly improve the efficacy.

Therefore, the inventor has provided the present invention of practicability after deliberate design and evaluation based on years of experience in the production, development and design of related products.

BRIEF SUMMARY OF THE INVENTION

The enhanced efficacy of the present invention is as follows:

Based on the unique configuration of the present invention wherein “the improved structure of cordless window curtain” allows said reducing guide slots to be set at one side of the lateral rail facing the curtain body, and the flanged guide shafts protruded from both ends of the hollow bottom rod at bottom of the curtain body can be inserted into said reducing guide slot, the present invention could, through narrowing design of the reducing guide slot, protect efficiently kids against unexpected insertion of fingers into the locating rope assembly. On the other hand, owing to the technical feature that the flanged guide shafts are inserted into said reducing guide slot, the curtain body could be elevated more smoothly and stably, and also positioned securely in the hanging state, thus improving the quality and applicability of the cordless window curtain.

The improvements brought about by this invention are as follow:

Given the structural configuration wherein the assembly element is designed into a rotary fastener, the cordless window curtain can be easily assembled or disassembled in a timely and efficient manner.

Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is an assembled perspective view of the preferred embodiment of the present invention.

FIG. 2 is a partial exploded perspective view of the preferred embodiment of the present invention.

FIG. 3 is a partial assembled sectional view of the preferred embodiment of the present invention.

FIG. 4 is an enlarged view of the assembly elements of the present invention along with the assembly view.

FIG. 5 is a plan front view of the cordless window curtain of the present invention.

FIG. 6 is a schematic view of the present invention wherein the curtain body is elevated in a pushing state.

DETAILED DESCRIPTION OF THE INVENTION

FIGS. 1, 2, 3 depict preferred embodiments of a cordless window curtain of the present invention, which, however, are provided for only explanatory objective for patent claims. Said cordless window curtain A includes a window curtain rod 10, transversely arranged rodlike, comprising of a hollow chamber 11 and at least two assembly elements 12. In this preferred embodiment, the window curtain rod 10 is designed with a

-shaped profile, and not limited to this. Said assembly elements 12 are used for assembling the window curtain rod 10 onto a preset object (e.g.: wall and window frame).

A curtain body 20 is hung vertically at the bottom of the window curtain rod 10 in an elevatable state. The curtain body 20 is provided with multiple rope-pulling holes 21 arranged vertically. A hollow bottom rod 22 is assembled at the bottom of the curtain body 20. The curtain body 20 is designed into either a shutter or a folding window curtain. The curtain body 20 disclosed in FIGS. 1-6 of the preferred embodiment is designed into a shutter.

Two lateral rails 30 are set at both sides of the curtain body 20 in a vertical extension state. A hollow slot 31 is formed within the lateral rail 30, and a rope head locating seat 32 is set at bottom of the lateral rail 30.

A locating rope assembly 40 has an upper locating section 41, two curtain body threading sections 42 and two lower locating sections 43. Of which, the upper locating section 41 is accommodated into the hollow chamber 11 of the window curtain rod 10, allowing for hanging securely the upper end of the locating rope assembly 40. Two curtain body threading sections 42 are located at interval, and extended vertically into the rope-pulling holes 21 of the curtain body 20. Two lower locating sections 43 are joined reversely and extended into the hollow bottom rod 22 at bottom of the curtain body 20. The ends 430 of two lower locating sections 43 (only marked in FIG. 2) are fixed separately onto the rope head locating seat 32 of two lateral rails 30, so as to form the lower fixing point of the locating rope assembly 40. The hollow bottom rod 22 could be supported specifically by the reverse joint of two lower locating section 43. When the hollow bottom rod 22 is shifted to any height or position by the force applied by the user, it could be positioned there even if the force is released.

An elastic tension component 50 is set onto the upper locating section 41 of the locating rope assembly 40, and used to keep the locating rope assembly 40 in certain elastic tension so as to realize the aforementioned supporting. Said elastic tension component 50 is made of a helical spring.

Two reducing guide slots 60 are set at one side of two lateral rails 30 facing the curtain body 20 and connected with the hollow slot 31. The width of the reducing guide slot 60 (W1) must be smaller than that of the lateral rail 30 (W2), as marked in FIG. 3. The width of the reducing guide slot 60 is preferably between 2 mm and 5.9 mm.

Two flanged guide shafts 70 are protruded from left and right ends of the hollow bottom rod 22 at bottom of the curtain body 20. These two flanged guide shafts 70 are provided with a through-hole 71 for threading of two lower locating sections 43 of the locating rope assembly. The outer end of two flanged guide shafts 70 is inserted into the reducing guide slot 60 of two lateral rails 30 (marked in FIG. 3), such that the flanged guide shaft can slide vertically along the path of the reducing guide slot 60.

Referring to FIG. 4, the assembly element 12 of the window curtain rod 10 is designed into a rotary fastener, which comprises of a holding box 121 and a fastening plate 122. The holding box 121 is provided with a holding space 123 and an assembly inlet 124 set at one side of the holding space 123, such that the end of the window curtain rod 10 can be assembled into the holding space 123 through the assembly inlet 124. A locating hole 125 is set at least one side of the holding box 121. The fastening plate 122 is pivoted at one side of the holding box 121 with assembly inlet 124. The fastening plate 122 can swing in an opening state, or is covered onto the assembly inlet 124 in a closing state. Moreover, a male locking portion 126 (a semi-circular salient point) and a female locking portion 127 (a round hole) that can be interlocked together are set on the fastening plate 122 and holding box 121, such that the closing state of the fastening plate 122 can be positioned. With the design of the fastener-type assembly element 12, the holding box 121 can be firstly locked securely onto two parallel locations of a preset object (e.g.: wall, window frame). Next the fastening plate 122 swings in an opening state, such that the end of the window curtain rod 10 is assembled into the holding space 123 of the holding box 121 through the assembly inlet 124 (shown by arrow L1), and then the fastening plate 122 is covered so as to finish the assembly and positioning of the window curtain rod 10. Conversely, when it is intended to remove the window curtain rod 10, the window curtain rod 10 can be released by opening the fastening plate 122, so the assembly element 12 hereto has advantages including: ease of assembly and disassembly, time-saving and high efficiency.

Based upon above-specified structural configuration, the present invention is operated as follows:

Referring to FIG. 6, said cordless window curtain A is operated in a way that the users can push or pull manually the hollow bottom rod 22 of the curtain body 20 (shown by arrow L2), so as to adjust the shielding area of the curtain body 20 and save the pull rope. The core aspect of the present invention lies in said reducing guide slot 60 and flanged guide shaft 70 with respective functions. 

1. A cordless window curtain comprising: a window curtain rod, transversely arranged rodlike, comprising of a hollow chamber and at least two assembly elements; a curtain body, hung vertically at the bottom of the window curtain rod in an elevatable state; the curtain body is provided with multiple rope-pulling holes arranged vertically; and a hollow bottom rod is assembled at the bottom of the curtain body; two lateral rails, set at both sides of the curtain body in a vertical extension state; a hollow slot is formed within the lateral rail, and a rope head locating seat is set at bottom of the lateral rail; a locating rope assembly, comprising of an upper locating section, two curtain body threading sections and two lower locating sections; of which the upper locating section is accommodated into the hollow chamber of the window curtain rod, allowing for hanging securely the upper end of the locating rope assembly; two curtain body threading sections are located at interval, and extended vertically into the rope-pulling holes of the curtain body; two lower locating sections are joined reversely and extended into the hollow bottom rod at bottom of the curtain body; besides, the ends of two lower locating sections are fixed separately onto the rope head locating seat of two lateral rails, so as to form the lower fixing point of the locating rope assembly; an elastic tension component, set onto the upper locating section of the locating rope assembly, and used to keep the locating rope assembly in certain elastic tension; two reducing guide slots, set at one side of two lateral rails facing the curtain body and connected with the hollow slot; the width of the reducing guide slot being smaller than that of the lateral rail; and the width of the reducing guide slot is preferably between 2 mm and 5.9 mm; two flanged guide shafts, protruded from left and right ends of the hollow bottom rod of the curtain body; these two flanged guide shafts are provided with a through-hole for threading of two lower locating sections of the locating rope assembly; and the outer end of two flanged guide shafts is inserted into the reducing guide slot of two lateral rails, such that the flanged guide shaft can slide vertically along the path of the reducing guide slot.
 2. The structure defined in claim 1, wherein said curtain body is a shutter or a folding window curtain.
 3. The structure defined in claim 1, wherein the assembly element of said window curtain rod is a rotary fastener, which comprises of a holding box and a fastening plate; the holding box is provided with a holding space and an assembly inlet set at one side of the holding space, such that the end of the window curtain rod can be assembled into the holding space through the assembly inlet; a locating hole is set at least one side of the holding box; the fastening plate is pivoted at one side of the holding box with assembly inlet; and the fastening plate can swing in an opening state, or is covered onto the assembly inlet in a closing state; moreover, male and female locking portions that can be interlocked together are set on the fastening plate and holding box, such that the closing state of the fastening plate can be positioned. 